Do I need a cost segregation study for every property I buy?

Not necessarily. The study makes the most financial sense on properties over $300,000 where you have taxable income to offset. For smaller properties or investors in lower tax brackets, the study fee may outweigh the benefit. Run the numbers with your CPA before commissioning one.

Can I do a cost segregation study on a property I already own?

Yes. A look-back study lets you catch up on missed depreciation in the current tax year using IRS Form 3115. You don't need to amend prior returns. This is a legitimate and commonly used strategy.

Does cost segregation trigger an audit?

A properly documented study following the IRS Audit Techniques Guide is a well-established, IRS-recognized strategy. Studies that are poorly documented or use unsupported allocations are the ones that attract scrutiny. Use a qualified firm.

What happens to the depreciation when I sell?

Depreciation is recaptured at sale. Personal property depreciation is recaptured at ordinary income rates; real property depreciation is recaptured at 25%. A 1031 exchange defers recapture indefinitely. Many investors plan their exit strategy around this from day one.

Does this work if I use a property manager?

It depends on how you structure your involvement. The STR passive loss rules require material participation if you want to use losses against active income. Using a property manager doesn't automatically disqualify you, but you need to meet one of the IRS material participation tests. Talk to a tax advisor about your specific situation.

Cost Segregation and Short-Term Rentals: How to Accelerate Your Depreciation

When you buy a rental property, the IRS lets you depreciate the building over 27.5 years (residential) or 39 years (commercial). That's a long runway. A cost segregation study shortens it considerably for a meaningful chunk of your purchase price, and for STR investors, the math can be striking.

What cost segregation actually does

A cost segregation study is an engineering analysis that breaks a property into its component parts. Instead of depreciating the entire building on a 27.5-year schedule, you identify which components qualify for 5-, 7-, or 15-year depreciation under MACRS (Modified Accelerated Cost Recovery System).

The components that typically qualify for shorter lives include:

Personal property (5–7 years): Appliances, carpeting, cabinetry, window treatments, furniture, and certain fixtures. In a furnished STR, this category is often substantial.
Land improvements (15 years): Driveways, parking areas, landscaping, fencing, outdoor lighting, and pools.
Building components (27.5 or 39 years): The structural shell, roof, HVAC systems, and plumbing that remain on the long schedule.

A typical residential property might have 20–30% of its purchase price reclassified into shorter-lived categories. On a $600,000 STR, that could mean $120,000–$180,000 of assets depreciating over 5–7 years instead of 27.5.

Why STRs are particularly well-suited for cost segregation

Two things make short-term rentals a better candidate than long-term rentals for this strategy.

First, STRs are typically furnished and equipped. The furniture, linens, kitchen equipment, and entertainment systems you buy for a guest-ready property are personal property, not real property. They depreciate on a 5-year schedule, and with bonus depreciation (more on that below), they may be fully deductible in year one.

Second, the STR tax loophole. Under IRC Section 469, rental activities are generally passive, meaning losses can only offset passive income. But short-term rentals with an average stay of 7 days or fewer are not classified as rental activities for passive loss purposes. If you materially participate in the STR, the losses are active, not passive, and can offset W-2 income, business income, or other active income. This makes the paper losses generated by accelerated depreciation actually usable.

How the numbers work

Say you buy a $700,000 STR in Naples. A cost segregation study identifies $175,000 in 5-year personal property and $70,000 in 15-year land improvements. With 100% bonus depreciation (restored for property placed in service after January 19, 2025), you could deduct the entire $175,000 in year one, plus a portion of the land improvements.

At a 37% marginal tax rate, $175,000 in additional first-year deductions is worth roughly $64,750 in tax savings. The cost of a study typically runs $5,000–$15,000 for a residential property. The ROI is usually immediate.

What a study costs and when it makes sense

Cost segregation studies are performed by engineering firms or specialized CPAs. Fees vary by property size and complexity:

Single-family STR under $500K: $4,000–$8,000
Single-family STR $500K–$1.5M: $7,000–$15,000
Multi-unit or commercial: $10,000–$25,000+

The general rule of thumb: a study makes financial sense when the property cost exceeds $300,000 and you have taxable income to offset. Below that threshold, the study fee may eat most of the benefit.

You can also do a look-back study on properties you already own. The IRS allows you to catch up on missed depreciation in the current tax year without amending prior returns, using a Form 3115 (Change in Accounting Method).

The recapture question

One thing to plan for: depreciation recapture. When you sell the property, the IRS recaptures accelerated depreciation at a 25% rate (for real property) or ordinary income rates (for personal property). This is a real cost, but it's deferred, and a 1031 exchange can push it further into the future indefinitely. Many investors treat recapture as a manageable trade-off for the time value of money on the upfront deductions.

Work with the right team

Cost segregation is not a DIY project. You need a qualified engineer or CPA who specializes in this area, and a tax advisor who understands the STR passive loss rules. The IRS has an Audit Techniques Guide specifically for cost segregation, and studies that don't follow its methodology are audit targets.

If you're evaluating a property in one of our markets, we're happy to connect you with the advisors we work with. Reach out through our investor inquiry form.